Product details

Frequency (Max) (kHz) 5000 UVLO thresholds on/off (V) 3.9/3.9 Supply voltage (Max) (V) 40 Features Isolated feedback generator, 1% reference, Synchronizable Operating temperature range (C) -55 to 125
Frequency (Max) (kHz) 5000 UVLO thresholds on/off (V) 3.9/3.9 Supply voltage (Max) (V) 40 Features Isolated feedback generator, 1% reference, Synchronizable Operating temperature range (C) -55 to 125
CDIP (J) 14 130 mm² 19.94 x 6.73
  • An Amplitude-Modulation System for Transformer Coupling an Isolated Feedback Error Signal
  • Low-Cost Alternative to Optical Couplers
  • Internal 1% Reference and Error Amplifier
  • Internal Carrier Oscillator Usable to 5MHz
  • Modulator Synchronizable to an External Clock
  • Loop Status Monitor
  • An Amplitude-Modulation System for Transformer Coupling an Isolated Feedback Error Signal
  • Low-Cost Alternative to Optical Couplers
  • Internal 1% Reference and Error Amplifier
  • Internal Carrier Oscillator Usable to 5MHz
  • Modulator Synchronizable to an External Clock
  • Loop Status Monitor

The UC1901 family is designed to solve many of the problems associated with closing a feedback control loop across a voltage isolation boundary. As a stable and reliable alternative to an optical coupler, these devices feature an amplitude modulation system which allows a loop error signal to be coupled with a small RF transformer or capacitor.

The programmable, high-frequency oscillator within the UC1901 series permits the use of smaller, less expensive transformers which can readily be built to meet the isolation requirements of today's line-operated power systems. As an alternative to RF operation, the external clock input to these devices allows synchronization to a system clock or to the switching frequency of a SMPS.

An additional feature is a status monitoring circuit which provides an active-low output when the sensed error voltage is within ±10% of the reference. The DRIVERA output, DRIVERB output, and STATUS output are disabled until the input supply has reached a sufficient level to allow proper operation of the device.

Since these devices can also be used as a DC driver for optical couplers, the benefits of 4.5 to 40V supply operation, a 1% accurate reference, and a high gain general purpose amplifier offer advantages even though an AC system may not be desired.

The UC1901 family is designed to solve many of the problems associated with closing a feedback control loop across a voltage isolation boundary. As a stable and reliable alternative to an optical coupler, these devices feature an amplitude modulation system which allows a loop error signal to be coupled with a small RF transformer or capacitor.

The programmable, high-frequency oscillator within the UC1901 series permits the use of smaller, less expensive transformers which can readily be built to meet the isolation requirements of today's line-operated power systems. As an alternative to RF operation, the external clock input to these devices allows synchronization to a system clock or to the switching frequency of a SMPS.

An additional feature is a status monitoring circuit which provides an active-low output when the sensed error voltage is within ±10% of the reference. The DRIVERA output, DRIVERB output, and STATUS output are disabled until the input supply has reached a sufficient level to allow proper operation of the device.

Since these devices can also be used as a DC driver for optical couplers, the benefits of 4.5 to 40V supply operation, a 1% accurate reference, and a high gain general purpose amplifier offer advantages even though an AC system may not be desired.

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Technical documentation

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Type Title Date
* Data sheet Isolated Feedback Generator datasheet (Rev. A) 13 Jan 2010
* SMD UC1901-SP SMD 5962-89441 08 Jul 2016
Selection guide TI Space Products (Rev. I) 03 Mar 2022
Application note DLA Standard Microcircuit Drawings (SMD) and JAN Part Numbers Primer 21 Aug 2020
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations 18 May 2020
Application note Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form 18 May 2020
Application note Single-Event Effects Confidence Interval Calculations 14 Jan 2020
More literature TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing 17 Jun 2019
E-book Radiation Handbook for Electronics (Rev. A) 21 May 2019
Application note The UC1901 Simplifies the Problem of Isolated Feedback in Switching Regulators 05 Sep 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

UC1843BEVM-CVAL — UC1843B-SP current mode PWM controller evaluation module

The UC1843BEVM-CVAL uses the UC1843A-SP, INA901-SP, LM139AQML-SP, and UC1901-SP to create an isolated feedback flyback with current sensing and over current flags. The UC1843A-SP is used to switch the low side MOSFET of the flyback converter and provide voltage and current to the output. The (...)
Simulation model

UCx901 Family TINA-TI Average Reference Design

SLUM058.TSC (1026 KB) - TINA-TI Reference Design
Simulation model

UCx901 Family TINA-TI Average Spice Model

SLUM059.ZIP (7 KB) - TINA-TI Spice Model
Simulation model

UCx901 Family PSpice Average Model

SLUM063.ZIP (88 KB) - PSpice Model
Simulation model

UCx901 Family TINA-TI Transient Reference Design

SLUM064.TSC (828 KB) - TINA-TI Reference Design
Simulation model

UCx901 Family TINA-TI Transient Spice Model

SLUM065.ZIP (9 KB) - TINA-TI Spice Model
Simulation model

UCx901 Family PSpice Transient Model

SLUM066.ZIP (42 KB) - PSpice Model
Reference designs

TIDA-070002 — 20- to 40-VIN, 50-W Space-grade isolated flyback DC/DC over-current protection reference design

Spacecraft bus voltages vary from the well-established 28-V to more than the 100-V typically used in highpower commercial communications satellites, this reference design shows an example for a space-grade 50-W isolated intermediary bus converter, while implementing over-current protection (OCP) (...)
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CDIP (J) 14 View options

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